hotwater versus steam

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Ed from chicago, Sep 28, 2005.

  1. Ed from chicago

    Ed from chicago Member

    Messages:
    62
    Location:
    Chicago
    What is the difference between a radiator shutoff for a steam system, versus a hotwater system? I've been told that a hotwater shutoff has a small pinhole in the rubber gasket, and the other doesn't. Is this true, and if so what is the hole for?


    Thanks very much...
  2. finnegan

    finnegan New Member

    Messages:
    250
    Location:
    CT
    Where is the valve located? I am not sure what you mean by "radiator shutoff?
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,491
    Location:
    Cave Creek, Arizona
    valve

    The steam valve has a rising stem with a composition gasket, not rubber, on the end of it. It will turn off completely. The hot water valve has a rotating sleeve, not a stem, and it does have a small hole in it to maintain some circulation even when shut off.
  4. Ed from chicago

    Ed from chicago Member

    Messages:
    62
    Location:
    Chicago
    Thanks HJ,

    I guess that they really are different, even though they look quite the same except for the hole. Then they can not be used interchangably, right?
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